Pneumatic hammer.



' PATENTED JUNE '25;- 1:907.

J. U. MOUAVENY. PNEUMATIC HAMMER.

APPLIUATION FILED F113. 5, 1906.

UNITED STATES PATENT OE IOE.

JOHN OORNELIUS MOOAVENY, 6F SUPERIOR, WISCONSIN.

PNEUMATIC HAMMER.

Specification of Letters Patent.

Patented June 25, 1907.

Application filed February 5,1906. Serial No. 299,606.

, scription of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to improvements in power hammers for riveting and similar purposes, and more particularly to those of the pneumatic type.

One object of the invention is to provide a simple, durable and comparatively inexpensive hammer of this character, by means of which rivets and the like may be quickly and easily headed in places where it is difficult, inconvenient or impossible to use hammers o the usual form.

Another object of the invention is to provide a pneumatic hammer of any Well known or approved type with a simple and eflicient attachment, by means of which the riveting head will be held upon the work during the riveting operation or until the rivet is headed.

A further object of the invention is to improve and simplify the construction and op eration of devices of this character and thereby render the Same more eflicient and durable in use and less expensive to manufacture.

With the above and other objects in view, the invention consists of certain novel fea tures of construction, combination and arrangement of parts as will be hereinafter more fully described and claimed.

In the accompanying drawings :-Figure 1 is a side elevation of a pneumatic hammer with my improvements applied thereto, the latter being shown in section; Fig. 2 is a view of the inner end of the attachment removed from the barrel of the pneumatic hammer; and Fig. 3 is a transverse sectional view taken on the line 33 in Fig. 1.

Referring to the drawings by numeral, 1 denotes a pneumatic or fluid operated hammer of any desired form and construction, but which preferably comprises a cylindrical barrel 2 of comparatively small diameter, within which the usual mechanism is mounted and from one end of which projects the usual rive ting head 3. My improved attachment 41, which is adapted to hold the head 3 upon the rivet or other work, is interposed between the usual handle 5 and the other end of the barrel 2. This attachment 4 consists of a cylindrical body 6, within which is formed a transverse partition 7. One end of the cylinder 6 is internally screw-threaded as at 8 to receive the similarly externally screwthreaded end of the barrel 2, and the opposite or Outer end of said cylinder 6 is closed by a cap or plug 9, which is screwed into said cylinder as shown at 10. Slidably mounted in a concentrically arranged opening 11 in the cap 9 is a cylindrical rod or stem 12, to the outer end of which is suitably attached the handle 5 and upon the inner end of which is provided a piston 13. The latter slides within the outer compartment 14 of the cylinder 6 or the space between the outer face of the partition 7 and the inner end of the cap 9. Said piston comprises a metal disk or head 15, a leather packing ring or disk 16 and a washer 17, said parts 15, 16 and 17 being secured upon the reduced end 18 of the stem or rod 12 by upsetting said end, as clearly shown in Fig. 1.

The air or other fluid under pressure that is used in operating the hammer is admitted into the same through an inlet pipe or connection 19, in which may be provided a controlling valve of any form and construction. This connection 19 is preferably screwed into the cylinder 6 in alinement with a passage or port 20, which is bored or otherwise formed in the partition 7 and which leads from its outer edge to the usual annular groove 21, which is formed in the inner face of the partition 7 or of the usual cap at the end of the hammer barrel 2. The air or other fluid is admitted into the cylinder or compartment 14 of the attachment through a port or passage 23, which opens into the port or passage 20, as shown in Fig. 1, so that when the valve in the inlet connection 19 is open to start the tool in operation, the air entering the compartment 14 will force the partition 7 and piston 13 away from each other and thus project the barrel 2 and. its head 3 against the rivet or other work.

As previously stated, the handle 5 may be of any desired form and construction.

The construction, Operation and advantages of the invention will be readily under stood from the foregoing description taken in connection with the accompanying drawings. It will be seen that this attachment when applied to a pneumatic or similar hammer of any form and construction, it will effectively hold the head upon the rivet so that it cannot slip or jump off while the rivet is being headed.

The device is of simple, durable and comparatively inexpensive construction, so that it may be manufactured at a comparatively small cost and will not be liable to get out of order.

Various changes in the form, proportion and the minor details of construction maybe'fihereof and having a partition provided With 0 resorted to Without departing from the principle or sacrificing of the advantages of the invention, as defined by the appended claims.

Having thus described my invention, what I claim as new and desire to secure by Letters-Patent is 1. The hereindescribed holding attachment for pneumatic hammers comprising a cylindrical body for attachment to one end of the hammer barrel and having a partition provided with an air passage and ports leading therefrom to the interior of the hammer barrel and to the interior of said body, a piston in said body, a cap at the outer end of said body and a rod extending from said piston through an opening in said cap, for the purpose set forth.

2. In combination With a pneumatic hammer, a cylindrical body attached to one end an air passage and ports leading therefrom to the interior of the hammer barrel and to the interior of said body, and a rod extending from said piston through an opening in said cap, substantially as described.

In testimony whereof I have hereunto set my hand in presence of two subscribing Witnesses.

JOHN CORNELIUS MCCAVENY.

Witnesses:

WV. W. STRICKLAND,

W. A. Woons. 

